Models·EASYHUB JOURNAL
Introducing Claude Fable 5.1 and Claude Mythos 5.1
What changed
Anthropic introduces Fable 5.1 and Mythos 5.1 as the same model with different safeguards. Fable 5.1 is generally available, while Mythos 5.1 is limited to trusted-access programs rather than being an ordinary release for all users.
- Original title
- Introducing Claude Fable 5.1 and Claude Mythos 5.1
- Source
- Anthropic · www.anthropic.com
- Topic
- Models
- Source month
- 2026-09
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Summary page published · Editorial information